Development of methods for inhibiting the corrosion of metals and new options for their application: a review. Part I. Atmospheric corrosion

• Yu.I. Kuznetsov and N.N. Andreev

A.N. Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Leninsky pr. 31, 119071 Moscow, Russian Federation

Abstract: Protection of metals against atmospheric corrosion can be achieved by adsorption of organic corrosion inhibitors (CIs) sometimes accompanied by their chemical conversion. The specifics of the protection of metals using contact and vapor-phase volatile corrosion inhibitors (VCI) and chamber corrosion inhibitors (CIN) are discussed. CIs can heal the defects in air-formed oxide-hydroxide layers, thus passivating the metal, or form oxide-free passive films. Both individual compounds and their mixtures can be used as CIs. The components of mixed CIs often mutually enhance the adsorption and anti-corrosion effects of each other. It is noted that the use of adsorption layers formed upon sequential treatment of a metal with various compounds for protection against atmospheric corrosion is a very promising technique. The important role of VCI chemisorption and the associated anti-corrosion post-treatment effect in the protection of metals under harsh conditions of high air humidity and recurrent moisture condensation is emphasized. The options for increasing the efficiency of metal protection through combined use of organic VCIs and volatile silanes, also by their layer-by-layer adsorption on the surface, are analyzed. The ability of silanes to undergo chemical transformations upon reactions with water vapor is found to be useful for creating nanosized coatings with an anti-corrosion post-treatment effect on metals from the vapor-gas phase. The specifics of the chamber protection of metals, which involves short-term treatment of metal items with vapors of inhibitors that have low volatility under normal conditions in a closed volume (chamber) at elevated temperatures, are considered. The chamber treatment is shown to be a promising method for the temporary protection of metals, which features significant advantages over conventional vapor-phase protection using VCIs. It has been found that the elevated temperature in the chamber not only provides volatility of inhibitors sufficient for vapor-phase protection, but also facilitates their chemisorption.

Keywords: atmospheric corrosion, corrosion inhibitors, contact inhibitors, volatile inhibitors, chamber inhibitors, chemisorption, anti-corrosion post-treatment effect

Int. J. Corros. Scale Inhib., 2023, 12, no. 4, 2171-2197
doi: 10.17675/2305-6894-2023-12-4-39

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